Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ecc0163e94f928a…

MALICIOUS

PDF

40.4 KB Created: 2020-08-04 11:39:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 324efe2f22858a790529fd3487b259b7 SHA-1: 89ef7a9096a5d711c19c0ef3bacb2cf7d4c7686e SHA-256: 1ecc0163e94f928a4600ddc945e802a24816543392ea9f42024e1e670338af98
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a link farm designed to appear as a coloring page, but it redirects to a malicious domain. The ML classifier strongly indicates maliciousness, and the PDF_MALICIOUS_REDIRECTOR_LINK heuristic confirms the presence of a link to known malicious infrastructure. The document body, though heavily obfuscated, contains the URL that initiates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.com/pify?keyword=bumblebee+transformer+coloring+page+pdf
    • http://files.stephengatt.com/uploads/1/3/2/3/132302951/ba639fe7500afa.pdf
    • http://files.bemanco.com/uploads/1/3/2/3/132303024/tevev-zijebunot-livir-laguxofuj.pdf
    • http://files.travisbenrobinson.com/uploads/1/3/1/8/131871569/a9d0d2ec0a5a.pdf
    • http://fekaga.evenanerd.com/uploads/1/3/1/4/131483281/7349930.pdf
    • https://cdn.shopify.com/s/files/1/0431/9831/6707/files/wuxupevak.pdf
    • https://cdn.shopify.com/s/files/1/0429/1549/6092/files/radiv.pdf
    • https://cdn.shopify.com/s/files/1/0440/7663/0181/files/86655207654.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/rirolor.pdf
    • https://cdn.shopify.com/s/files/1/0431/9870/9918/files/14246009312.pdf
    • https://cdn.shopify.com/s/files/1/0437/1690/3080/files/jagitigizuzekufomog.pdf
    • https://cdn.shopify.com/s/files/1/0434/6406/5190/files/precalculus_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0437/7152/7325/files/niluwagotexuzutu.pdf
    • https://cdn.shopify.com/s/files/1/0429/8145/8069/files/bigibijaw.pdf
    • https://cdn.shopify.com/s/files/1/0439/0476/2011/files/lisuvojipax.pdf
    • https://cdn.shopify.com/s/files/1/0429/8267/0485/files/bexibovevilanij.pdf
    • https://cdn.shopify.com/s/files/1/0431/0440/3613/files/73418161627.pdf
    • https://cdn.shopify.com/s/files/1/0432/3095/3630/files/26390435033.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005f45.bin
11cff5748e00ad82baff1a5ca17016c12e6bd756554775dc3b3a89c31fb9df40
pdf-font-stream PDF embedded font (sfnt) at offset 0x5F45 5664 bytes
font_01_sfnt_off00007269.bin
974406a4ba827159ba8db81565dedd1731343245c46c4dd051d48177001d3131
pdf-font-stream PDF embedded font (sfnt) at offset 0x7269 10008 bytes